Back in 2004, my good friend Jo and I went for a walk along the Thames, from Woolwich to Canary Wharf. It was a cold, grey Sunday in January. I loved it, and I probably have more memories of that day than most of the parties I went to back then. Over the next ten years, Jo and I walked upstream as far as Hampton Court, and downstream as far as the fascinating Hoo Peninsula in the Thames Estuary. I took a lot of not very good photos along the way. Sometime around 2016, I carri